Development of Corrosion Depth Evaluation Method in Steel Pipe by Acoustic Emission Method

• Kurihara Takuya

  School of science and technology, Meiji University

• Takuma Matsuo

  School of science and technology, Meiji University

• Kono Taro

  TOKYO GAS CO., LTD., Materials Science and Engineering Team, Fundamental Technology Research_Institute

• Numata Kaori

  TOKYO GAS CO., LTD., Materials Science and Engineering Team, Fundamental Technology Research_Institute

Bibliographic Information

Other Title

• AE法を用いた鋼管の腐食深さ評価手法の開発
• AEホウ オ モチイタ コウカン ノ フショク フカサ ヒョウカ シュホウ ノ カイハツ

Abstract

Steel pipes used for the transportation of materials, such as tap water and gas, can leak due to corrosion. Therefore, monitoring the conditions of these pipes is significantly important. In this study, an inspection and monitoring method for evaluating the corrosion losses of steel pipes was developed using the acoustic emission （AE） method. First, steel pipes with different corrosion losses were installed, and AE monitoring was performed for one month. Corrosion loss was evaluated using an intensity ratio representing the maximum amplitude of wavelet coefficient of the longitudinal and flexural modes in the AE signals （i.e., AE wavelet coefficient ratio） resulting from the fractures caused by rust. The AE wavelet coefficient ratio changed with increasing corrosion depth, and a relationship between the corrosion loss and the change in the AE wavelet coefficient ratio was observed. This result indicated that the corrosion loss could be evaluated using AE monitoring. Next, a thermal cycle was applied to the corroded areas of the steel pipes, and the AE signals were monitored. The fracturing resulting from the rust produced several AE signals, and the AE wavelet coefficient ratio changed depending on the corrosion depth. Therefore, the corrosion loss could also be evaluated by applying the AE wavelet coefficient ratio to an AE measurement test with a thermal cycle.

Journal

• Zairyo-to-Kankyo

  Zairyo-to-Kankyo 70 (2), 40-46, 2021-02-10

  Japan Society of Corrosion Engineering

Keywords

• acoustic emission
• steel pipe
• corrosion
• thermal cycle

Details

• CRID: 1390288912170004352
• NII Article ID: 130008071042
• NII Book ID: AN10235427
• DOI: 10.3323/jcorr.70.40
• ISSN: 18819664
• ISSN: 09170480
• NDL BIB ID: 031307812
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031307812
• Web Site: https://www.jstage.jst.go.jp/article/jcorr/70/2/70_40/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed